2015's PotterCon gathered almost 1,000 Hogwarts alums for a day of witchcraft and wizardry, and this year we're swish-and-flicking our way to an even bigger and better event. So dig your dusty old robes out of storage, accio your friends and come throw back some Butterbeers with other magic-loving adults. The day promises to be 4,224 pages worth of fun... Until the very end.